Abstract
An experimental investigation is presented into the failure behaviors of the G50 ultra-high strength steel targets struck by tungsten alloy spherical fragments at high velocity. The depth of penetration and the crater volume of G50 steel targets at velocities ranging from 923 to 1,807 m/s are obtained by ballistic gun experiments. A conic-like crater is observed in the G50 steel target after impact by a tungsten alloy spherical fragment, which is different from that in the experiments of low strength steel targets. It is believed that the eroding and fragmentation of the tungsten fragment during the penetration process give rise to this phenomenon. In addition, several tensile cracks are found both at the crater surface and the crater bottom, which are considered to be caused by tensile stress induced by the superposition of rarefaction waves at some local areas of the impacted interface. Numerical simulations of the penetration of tungsten alloy fragments into G50 steel targets are performed to predict failure features of the targets. It is shown that the numerical results are in good agreement with available experimental results.
Highlights
In modern warfare, the fragment anti-missile warhead is widely applied to intercept and destroy the incoming missile
It can be found from the G50 steel target after impact that a raised lip on the front surface combined with spall is produced by the tungsten alloy fragment and layered cracks occurs at the rough crater surface
The crater formed in the G50 steel target after impact by a tungsten alloy spherical fragment is conic-like, which is different from that in the low strength steel target tests
Summary
The fragment anti-missile warhead is widely applied to intercept and destroy the incoming missile. The warhead is a key component of the missile to destroy the targets. Due to its low price and high strength, G50 (28CrMnSiNi4MoNb) ultra-high strength steel, a kind of low alloy steel without cobalt, has been widely used as material for penetrating warhead shell (Zhang et al, 2019). Tungsten alloy has become the main choice for the design of anti-missile warhead fragments with its good physical and mechanical capabilities of high density, small attenuation coefficient and strong ability of piercing armor. It is of great significance to study the damage characteristics of G50 ultra-high strength steel under the impact of tungsten alloy fragments for designing the penetrating warhead shell
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